Safety helmet



FIG. 1 is a front, right-side, top perspective view of a safety helmet, showing the new design;

FIG. 2 is a rear, left-side, top perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left-side elevational view thereof;

FIG. 6 is a right-side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines depict portions of the safety helmet that form no part of the claimed design. The dash-dot broken lines in FIGS. 3 and 8 depict the boundaries of the claimed design and form no part of the claimed design. 

CLAIM The ornamental design for a safety helmet, as shown and described. 